rtcsram.c revision 1.1.2.2
1 1.1.2.2 martin /* $NetBSD: rtcsram.c,v 1.1.2.2 2024/02/03 11:47:04 martin Exp $ */ 2 1.1.2.2 martin 3 1.1.2.2 martin /*- 4 1.1.2.2 martin * Copyright (c) 2024 Jared McNeill <jmcneill (at) invisible.ca> 5 1.1.2.2 martin * All rights reserved. 6 1.1.2.2 martin * 7 1.1.2.2 martin * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 martin * modification, are permitted provided that the following conditions 9 1.1.2.2 martin * are met: 10 1.1.2.2 martin * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 martin * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 martin * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 martin * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 martin * documentation and/or other materials provided with the distribution. 15 1.1.2.2 martin * 16 1.1.2.2 martin * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1.2.2 martin * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1.2.2 martin * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1.2.2 martin * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1.2.2 martin * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.1.2.2 martin * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.1.2.2 martin * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.1.2.2 martin * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.1.2.2 martin * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.2 martin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.2 martin * SUCH DAMAGE. 27 1.1.2.2 martin */ 28 1.1.2.2 martin 29 1.1.2.2 martin #include <sys/cdefs.h> 30 1.1.2.2 martin __KERNEL_RCSID(0, "$NetBSD: rtcsram.c,v 1.1.2.2 2024/02/03 11:47:04 martin Exp $"); 31 1.1.2.2 martin 32 1.1.2.2 martin #include <sys/param.h> 33 1.1.2.2 martin #include <sys/bus.h> 34 1.1.2.2 martin #include <sys/device.h> 35 1.1.2.2 martin #include <sys/systm.h> 36 1.1.2.2 martin #include <dev/clock_subr.h> 37 1.1.2.2 martin 38 1.1.2.2 martin #include <lib/libkern/libkern.h> 39 1.1.2.2 martin 40 1.1.2.2 martin #include "exi.h" 41 1.1.2.2 martin 42 1.1.2.2 martin #define WII_RTCSRAM_ID 0xfffff308 43 1.1.2.2 martin 44 1.1.2.2 martin #define RTC_BASE 0x20000000 45 1.1.2.2 martin #define SRAM_BASE 0x20000100 46 1.1.2.2 martin 47 1.1.2.2 martin #define WRITE_OFFSET 0x80000000 48 1.1.2.2 martin 49 1.1.2.2 martin struct rtcsram_sram { 50 1.1.2.2 martin uint16_t checksum[2]; 51 1.1.2.2 martin uint16_t ead[2]; 52 1.1.2.2 martin int32_t counter_bias; 53 1.1.2.2 martin int8_t display_offset_h; 54 1.1.2.2 martin uint8_t ntd; 55 1.1.2.2 martin uint8_t language; 56 1.1.2.2 martin uint8_t flags; 57 1.1.2.2 martin uint16_t flash_id[12]; 58 1.1.2.2 martin uint32_t wireless_keyboard_id; 59 1.1.2.2 martin uint32_t wireless_pad_id[2]; 60 1.1.2.2 martin uint8_t last_dvd_errorcode; 61 1.1.2.2 martin uint8_t padding1; 62 1.1.2.2 martin uint16_t flash_id_checksum[2]; 63 1.1.2.2 martin uint16_t padding2; 64 1.1.2.2 martin } __aligned(32); 65 1.1.2.2 martin CTASSERT(sizeof(struct rtcsram_sram) == 64); 66 1.1.2.2 martin 67 1.1.2.2 martin struct rtcsram_softc { 68 1.1.2.2 martin struct todr_chip_handle sc_todr; 69 1.1.2.2 martin 70 1.1.2.2 martin uint8_t sc_chan; 71 1.1.2.2 martin uint8_t sc_device; 72 1.1.2.2 martin 73 1.1.2.2 martin struct rtcsram_sram sc_sram; 74 1.1.2.2 martin }; 75 1.1.2.2 martin 76 1.1.2.2 martin static int rtcsram_match(device_t, cfdata_t, void *); 77 1.1.2.2 martin static void rtcsram_attach(device_t, device_t, void *); 78 1.1.2.2 martin 79 1.1.2.2 martin static uint32_t rtcsram_read_4(struct rtcsram_softc *, uint32_t); 80 1.1.2.2 martin static void rtcsram_write_4(struct rtcsram_softc *, uint32_t, uint32_t); 81 1.1.2.2 martin static void rtcsram_read_buf(struct rtcsram_softc *, uint32_t, void *, 82 1.1.2.2 martin size_t); 83 1.1.2.2 martin 84 1.1.2.2 martin static int rtcsram_gettime(todr_chip_handle_t, struct timeval *); 85 1.1.2.2 martin static int rtcsram_settime(todr_chip_handle_t, struct timeval *); 86 1.1.2.2 martin 87 1.1.2.2 martin CFATTACH_DECL_NEW(rtcsram, sizeof(struct rtcsram_softc), 88 1.1.2.2 martin rtcsram_match, rtcsram_attach, NULL, NULL); 89 1.1.2.2 martin 90 1.1.2.2 martin static int 91 1.1.2.2 martin rtcsram_match(device_t parent, cfdata_t cf, void *aux) 92 1.1.2.2 martin { 93 1.1.2.2 martin struct exi_attach_args * const eaa = aux; 94 1.1.2.2 martin 95 1.1.2.2 martin return eaa->eaa_id == WII_RTCSRAM_ID; 96 1.1.2.2 martin } 97 1.1.2.2 martin 98 1.1.2.2 martin static void 99 1.1.2.2 martin rtcsram_attach(device_t parent, device_t self, void *aux) 100 1.1.2.2 martin { 101 1.1.2.2 martin struct rtcsram_softc * const sc = device_private(self); 102 1.1.2.2 martin struct exi_attach_args * const eaa = aux; 103 1.1.2.2 martin 104 1.1.2.2 martin aprint_naive("\n"); 105 1.1.2.2 martin aprint_normal(": RTC/SRAM\n"); 106 1.1.2.2 martin 107 1.1.2.2 martin sc->sc_chan = eaa->eaa_chan; 108 1.1.2.2 martin sc->sc_device = eaa->eaa_device; 109 1.1.2.2 martin 110 1.1.2.2 martin /* Read RTC counter bias from SRAM. */ 111 1.1.2.2 martin rtcsram_read_buf(sc, SRAM_BASE, &sc->sc_sram, sizeof(sc->sc_sram)); 112 1.1.2.2 martin aprint_debug_dev(self, "counter bias %d\n", sc->sc_sram.counter_bias); 113 1.1.2.2 martin hexdump(aprint_debug, device_xname(self), &sc->sc_sram, 114 1.1.2.2 martin sizeof(sc->sc_sram)); 115 1.1.2.2 martin 116 1.1.2.2 martin sc->sc_todr.cookie = sc; 117 1.1.2.2 martin sc->sc_todr.todr_gettime = rtcsram_gettime; 118 1.1.2.2 martin sc->sc_todr.todr_settime = rtcsram_settime; 119 1.1.2.2 martin todr_attach(&sc->sc_todr); 120 1.1.2.2 martin } 121 1.1.2.2 martin 122 1.1.2.2 martin static uint32_t 123 1.1.2.2 martin rtcsram_read_4(struct rtcsram_softc *sc, uint32_t offset) 124 1.1.2.2 martin { 125 1.1.2.2 martin uint32_t val; 126 1.1.2.2 martin 127 1.1.2.2 martin exi_select(sc->sc_chan, sc->sc_device); 128 1.1.2.2 martin exi_send_imm(sc->sc_chan, sc->sc_device, &offset, sizeof(offset)); 129 1.1.2.2 martin exi_recv_imm(sc->sc_chan, sc->sc_device, &val, sizeof(val)); 130 1.1.2.2 martin exi_unselect(sc->sc_chan); 131 1.1.2.2 martin 132 1.1.2.2 martin return val; 133 1.1.2.2 martin } 134 1.1.2.2 martin 135 1.1.2.2 martin static void 136 1.1.2.2 martin rtcsram_write_4(struct rtcsram_softc *sc, uint32_t offset, uint32_t val) 137 1.1.2.2 martin { 138 1.1.2.2 martin offset |= WRITE_OFFSET; 139 1.1.2.2 martin 140 1.1.2.2 martin exi_select(sc->sc_chan, sc->sc_device); 141 1.1.2.2 martin exi_send_imm(sc->sc_chan, sc->sc_device, &offset, sizeof(offset)); 142 1.1.2.2 martin exi_send_imm(sc->sc_chan, sc->sc_device, &val, sizeof(val)); 143 1.1.2.2 martin exi_unselect(sc->sc_chan); 144 1.1.2.2 martin } 145 1.1.2.2 martin 146 1.1.2.2 martin static void 147 1.1.2.2 martin rtcsram_read_buf(struct rtcsram_softc *sc, uint32_t offset, void *data, 148 1.1.2.2 martin size_t datalen) 149 1.1.2.2 martin { 150 1.1.2.2 martin exi_select(sc->sc_chan, sc->sc_device); 151 1.1.2.2 martin exi_send_imm(sc->sc_chan, sc->sc_device, &offset, sizeof(offset)); 152 1.1.2.2 martin exi_recv_dma(sc->sc_chan, sc->sc_device, data, datalen); 153 1.1.2.2 martin exi_unselect(sc->sc_chan); 154 1.1.2.2 martin } 155 1.1.2.2 martin 156 1.1.2.2 martin static int 157 1.1.2.2 martin rtcsram_gettime(todr_chip_handle_t ch, struct timeval *tv) 158 1.1.2.2 martin { 159 1.1.2.2 martin struct rtcsram_softc * const sc = ch->cookie; 160 1.1.2.2 martin uint32_t val; 161 1.1.2.2 martin 162 1.1.2.2 martin val = rtcsram_read_4(sc, RTC_BASE); 163 1.1.2.2 martin tv->tv_sec = (uint64_t)val + sc->sc_sram.counter_bias; 164 1.1.2.2 martin tv->tv_usec = 0; 165 1.1.2.2 martin 166 1.1.2.2 martin return 0; 167 1.1.2.2 martin } 168 1.1.2.2 martin 169 1.1.2.2 martin static int 170 1.1.2.2 martin rtcsram_settime(todr_chip_handle_t ch, struct timeval *tv) 171 1.1.2.2 martin { 172 1.1.2.2 martin struct rtcsram_softc * const sc = ch->cookie; 173 1.1.2.2 martin 174 1.1.2.2 martin rtcsram_write_4(sc, RTC_BASE, tv->tv_sec - sc->sc_sram.counter_bias); 175 1.1.2.2 martin 176 1.1.2.2 martin return 0; 177 1.1.2.2 martin } 178
Indexes created Fri Oct 03 17:10:05 GMT 2025